The famous squid sister Callie of the squid-sisters! She is very cheerful and excitable, and usually sports a grin on her face. She values her bond with her cousin Marie / Agent 2, the two having been inseparable since they were young. As children, they enjoyed star-gazing and playing tag together. She is particularly attentive to Marie's changes in mood, even noting when the latter wants to drink a latte based on expression alone. When by herself, however, Callie can become upset and prone to overthinking.
She is rather fond of puns, and uses them from time to time, a habit that tends to annoy her cousin. She is also optimistic and caring.

She along with her Cousin Marie play as support roles for Madeline / agent 3. They give her new assignments and inform her of any suspicious or criminal activities going on in Inkopolis.